Tool for manufacturing metallic caps, cups, or similarly-shaped articles.



'No. 677,!93. Patented June 25, I90! W. C. FISCHER.

TDDL FOR MANUFACTURING METALLIC GAPS, CUPS, 0B SIMILABLYSHAPED'ABTIGLES.

(Applicatiau fl led Apr. 17, 1900.)

1 UNITED STATES PATENT OFFICE.

WILLIAM CHARLES FISCHER, OF PIMLICO, LONDON, ENGLAND.

TOOL FOR MANUFACTURING METALLIC CAPS, CUPS, ORSlMiLAELY-SHAPED'ARTICLES] SPECIFIGATION forming part of Letters PatentNo. 677,193, dated June 25, 1901.

Application filed April 17, 1900. Serial No. 13,196. (No model.)

To (0Z5 whom it 171,614 concern/.-

Be it known that I, WILLIAM CHARLES FISCHER, foreman, of 29 Gillinghamstreet, Pimlico, in the county of London, England, have invented acertain new and useful Improvement in Tools for Manufacturing Me tallicCaps, Cups, and Similarly-Shaped Articles, of which the followingis aspecification.

In the accompanying drawings, Figure 1 is a vertical section of a dieand punch before striking a blow. Fig. 2 is a similar view afterstriking the blow, and Fig. 3 shows the punch withdrawn with the articlepartly thrown off. Fig. 4 shows a die with an open bottom.

This invention relates to the manufacture of metallic caps, cups, andsimilarly-shaped articles by striking up or drawing them from sheetmetal, such articles being used for various purposes in the arts; andthe object of the invention is to facilitate the manufacture of saidcaps, cups, or other articles. Hitherto articles of this character havebeen drawn by the aid of a die and plunger, and besides someirregularities in the size of the articles due to various causes-forinstance, irregularity in the thickness of the metal em ployed-theyrequired to be subjected to a finishing or trimming process in order toremove the bur from the lip or the ragged edge of the article. Accordingto the present invention these two operations of drawing and trimmingare effected at one time by means of a special tool, which forms thesubject of the invention, and thus a great saving of time and laborresults, and a better and more regularly-sized article is produced.

a is a die of the usual form, which is fixed in a block or securely heldin any other con venient manner. The diameter of the die will correspondto the external diameter of the article to be produced.

b is a plunger of a suitable press or other machine, to which is adapteda punch a. The size of this punch 0 corresponds to the internal diameterand depth of the article to be produced.

The attachment of the punch c to the plunger b is, as shown in thedrawings, by means of a screw-thread; butit is obvious that it may beeffected in any other convenient manner.

In the drawings the punch c is shown as provided with a central pin orstud d, which is elastically yielding by means of the spring 9,contained in a recess of the plunger 17. The object of this pin or studd is to throw off the finished cap from the punch so soon as it iswithdrawn from the die. The use of this pin or stud is not, however,absolutely necessary, as any other known method for effecting the sameobject may be employed.

Between the punch c and the plunger 1) I insert an annular steel cutterf, the diameter of the cutting-head of which corresponds with theexternal diameter of the article to be produced and the internaldiameter of the die a. This cutter f will just enter within the die a,so that it will nip or shear 01? any excess of metal on the edge of thecap, which will thus be trimmed as well as drawn atone operation.

By means of this tool the size of the caps will be carefully gagednotwithstanding any difference in the thickness of the metal sheet fromwhich the blanks are cut, as the drawing operation will reduce the metalto its proper thickness, and the cutter will remove the excess of metal,whatever it may be, thus producing articles of the same gage absolutelywithout any necessity for submitting the article to a finishing 0rtrimming operation in a lathe or otherwise. The finished cap may bedelivered through the bottom of the die, as shown in Fig. 4, or it maybelifted out of the die by the plunger when the said die has a closedbottom, as shown in Figs. 1 and 2.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is-- 1. A tool for producing caps, cups, andsimilarly-shaped articles, by drawing a metal blank in a die, consistingof a plunger, a punch of a size equal to the internal dimensions of thearticle to be produced, and secured to the plunger in any convenient manner, and a removable annular steel cutter placed between the punch andthe plunger, for shearing off any excess of metal, and having anexternal diameter equal to that of the article to be produced, all asherein shown and described.

2. A tool for producing caps, cups and similarly-shaped articles by,drawing a metal blank in a die, consisting of a plunger, a

punch having parallel sides and of a sizeequal to the internaldimensions of the article to be produced and secured to the plunger inany convenient manner, and a removable annular steel cutter placedbetween the punch and the plunger to coact with the internal face of thedie to shear off any excess of metal and having an external diameterequal to that of the article to be produced, all as herein shown anddescribed.

3. The combination with a die for forming caps, cups andsimilarly-shaped articles from a metal blank, said die having parallelsides and a flaring mouth, of a toolconsisting ofa plunger, a punchhaving parallel sides and of

